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Abstract #1802

Multi-Channel MOSFET Amplifiers for Parallel Excitation in 7T Animal MRI System

Yizhe Zhang 1 , Yan Liu 1 , Bingyao Sun 1 , Xiaoliang Zhang 2 , and Xiaohua Jiang 1

1 Department of Electrical Engineering, Tsinghua University, Beijing, China, 2 Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States

In this work, we developed a multi-channel transmission system with compact MOSFET amplifiers for parallel excitation in 7T animal MRI scanner. The system is composed of a multi-channel RF controller and 4 independent RF power amplifiers. Each amplifier contains two stages (using transistor MRF321 and MOSFET MRF177 for the first and second stage respectively). The design was validated by simulation and bench test. The power gain for the amplifier is 18.7dB at 300MHz, demonstrating the sufficient amplification capability of the transmission system for small animal parallel transmission applications at 7T.

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